<div *ngIf="book">
  <h2>《{{book.bname}}》的详情</h2>
  <div><label>序号: </label>{{book.id}}</div>
  <div>
    <label>数量: </label>
    <input [(ngModel)]="book.number" placeholder="number"/>
  </div>
  <div>
    <label>编号: </label>
    <input [(ngModel)]="book.bid" placeholder="bid"/>
  </div>
  <div>
    <label>名称: </label>
    <input [(ngModel)]="book.bname" placeholder="bname"/>
  </div>
  <div>
    <label>简介：</label>
    <textarea [(ngModel)]="book.description" placeholder="description"></textarea>
  </div>
</div>